I just wanted to make a quick post to gauge interest before I spend anymore time on this project.
I just designed a bill validator emulator for my PT-2B. It runs on an ESP32 and sits between and/or in place of the DBV-145. I have it setup to keep the machine credited at all times. I guess it would work good as a freeplay mod.
I hope in the future I will use this to retroit a DBV200 to accept TITO tickets on an otherwise incompatible machine!
If anyone is interested in trying it out, post a reply. I will make a quick write up and publish the code if anyone wants!